Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028700 |
Grain‐size distribution and propagation effects on seismic signals generated by bedload transport | |
Sophie Lagarde; Michael Dietze; Florent Gimbert; Jonathan B. Laronne; Jens M. Turowski; Eran Halfi | |
2021-03-17 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Bedload transport is a key process in fluvial morphodynamics, but difficult to measure. The advent of seismic monitoring techniques has provided an alternative to in‐stream monitoring, which is often costly and cannot be utilised during large floods. Seismic monitoring is a method requiring several steps to convert seismic data into bedload flux data. State‐of‐the‐art conversion approaches exploit physical models predicting the seismic signal generated by bedload transport. However, due to a lack of well‐constrained validation data, the accuracy of the resulting inversions is unknown. We use field experiments to constrain a seismic bedload model and compare the results to high‐quality independent bedload measurements. Constraining the Green’s function (i.e., seismic ground properties) with an active seismic survey resulted in an average absolute difference between modelled and empirically measured seismic bedload power of 11 dB in the relevant frequency band. Using generically estimated Green’s function parameters resulted in a difference of 20 dB, thus highlighting the importance of using actual field parameters. Water turbulence and grain hiding are unlikely to be the cause of differences between field observations and our analysis. Rather, they may be either due to the inverted model being particularly sensitive to the coarse tail of the grain‐size distribution, which is least well constrained from field observations, or due to the seismic model underestimating effects of the largest grains. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/319862 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Sophie Lagarde,Michael Dietze,Florent Gimbert,等. Grain‐size distribution and propagation effects on seismic signals generated by bedload transport[J]. Water Resources Research,2021. |
APA | Sophie Lagarde,Michael Dietze,Florent Gimbert,Jonathan B. Laronne,Jens M. Turowski,&Eran Halfi.(2021).Grain‐size distribution and propagation effects on seismic signals generated by bedload transport.Water Resources Research. |
MLA | Sophie Lagarde,et al."Grain‐size distribution and propagation effects on seismic signals generated by bedload transport".Water Resources Research (2021). |
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